Conver meta text to document for Google Apps Script works in Document container. metas line equals #page , do page break line ends with #14b ,line convert to font-size 14 and bold text

metaconvert.js

/**
Conver meta text to document

metas
line equals #page , do page break
line ends with #14b ,line convert to font-size 14 and bold text

todo
#{font-size}{i|b|p|ib};

 */
function convertDocument() {
  var doc = DocumentApp.getActiveDocument();
  var body = doc.getBody();

  var bodyElement = DocumentApp.getActiveDocument().getBody();
  var text=bodyElement.getText();
  var lines=text.split("\n");
  
  body.setText("");//for clear text.i'm not sure.
  var ps=body.getParagraphs();
  var lastParagraph=ps[ps.length-1];
  
  for(var i=0;i<lines.length;i++){
   var line=lines[i];
    if(line == ""){
      //continue;
      line="";
    }
    if(line == "#page"){
     var page=body.appendPageBreak();
     lastParagraph=page.getParent().asParagraph();
     continue;
    }
    
    var fontsize=11;
    var bold=false;
    if(line.endsWith("#14b")){
      line=line.substring(0,line.length-4);
      fontsize=14;
      bold=true;
    }
    
    var tex=lastParagraph.appendText(line+"\n"); 
    tex.setBold(bold);
    tex.setFontSize(fontsize);
    }
   
  
  
};
String.prototype.endsWith = function(suffix) {
    return this.indexOf(suffix, this.length - suffix.length) !== -1;
};